Wrench.



0. A. CHRISTOPHERSON.

WRENCH.

APPLIOATION FILED 0017.25, 1913.

1,099,427, Patented June 9,1914.

Wt tn esse.s Illvantor J 7 Ole A. clg'sto herson 'ITED STATES PATENT OFFIGE;

OLE A. CHRISTOPHERSON, 0F SEATTLE, WASHINGTON, ASSIGNOR OF ONE-FOURTH TO FRED W. CHANDLER AND.O1\TE-FOURTH1 TO OLUF LARSEN, BOTH .OF SIEIATILE,

WASHINGTON.

WRENCH.

Specification of Letters Patent.

Application'filed October 25, 1913.

Patented June 9, 1914.

SerialNo. 797,343.

Washington, have invented certain new and useful Improvements in Wrenches, of which the following is a specification.

My invention relates to wrenches, and

consists of certain improvements in that type of wrenches which employ jaws pivoted to each other and whichopen and close to fit nuts or pipes of differing sizes.

The object of my invention is to improve and simplify such a wrench and to make 1t. of such design that it shall be strong and easy to make and generally efficient and durable.

My invention comprises the various parts and combinations of parts which will be hereinafter described and particularly pointed out in the claim.

In the accompanying drawings I have shown my invention embodied in the form which is now preferred by me.

Figure 1 is a side viewof the WIGIICh VYItlI the jaws in their extreme closed position. Fig. 2 is a similar view showing the aws in their extreme open position. Fig. shows the two jaws in an intermediate p0Sit1011 and how the supplemental face at the outer end of one of the jaws cooperates with the other jaw to hold a small nut. Fig. 4: is asectlon of the handle looking toward and showing the head and jaws. Fig. 5 is an edge view of the head end of the handle showing the claws.

To one end of the handle 1 is pivoted the primary jaw 2, by a pivot 13. Thesecondary jaw 3 is pivoted to the, primary jaw, the pivot 23 by which they are connected being located at a point intermediate their ends, preferably at about the middle point of their length. This pivot point is also located somewhat to one side ofthe main body of the jaws. I have shown one of the jaws, as the primary jaw 2, as provided with two separated ears 21 and the secondary jaw 3 as provided with a central ear 31 which fits between the ears 21 of the primary jaw, a pivot pin 23 connecting them together. The outer end of each jaw has its inner face, or that face which opposes the corresponding. face of the other jaw,provided withia reentrant angle, as 22 and 32, whichis preferably such as will fit the corners of nuts, or 120. Part or all of theinner faces of these jaws, may be toothed, as shown in Fig. 1, so as to enable a secure grip to be had upon. pipes.

The inner or tail end of the secondary aw 3, 1s connected with the handle by means of links 42 and pivot pins l0 and 14, so that the inner or tail end of the secondary jaw is compelled to swing 1n an arc of a circle having the pin 14 as a center... This pivot:

pin 14: is inward from the pivot pin 13 by which the primary jaw is pivoted to the handle, the result of the different location of these pins being that, as the jaws are swung upon. the handle, their outer ends will be separated or brought together, in accordance with the direction of motion. nection between the handle and the secondary jaw, would be suflicient to obtainthe proper movement of the jaws relative to each other, but I have shown additional means which act to secure thesame result. consists of a curved edge surface 11 of the head of the handle, which is made eccentric relative to the pivot point 13 of the primary jaw but concentric to the pivot point 40of the link,if the link is also used. The inner or tail end of the secondary jaw, is designed to be supported by engagement with the curved surface 11 of the handle. This may be by a direct sliding engagement of the tail end 30, of the jaw with the surface 11, or, as I prefer, by engagement of the curved surface 11 by a roller 4 which is journaled upon the in 40 and between ears formed:

face 11 should be an arc of a circle having its by slitting this end of the jaw. This surcenter coinciding with the pivot connection between the links 42 and the handle, which pivot point is inward from the point of pivoting between the handle and the pri mary jaw. projection be extended to form a semi-detached slotted claw 12.

The inner or gripping face of one of the The link coni This l I also prefer that this cam-like H untilapplied to the nut or pipe, I may pro-V ing portion of the face of the opposite jaw, in theaverage position in which it would be used. 7

The proportions of the parts of the jaws and the manner of mountingthem upon the handle and controlling their swinging, are I such that they will securely engage and hold any nut or pipe within the range of their capacity.

To provide a suflicient friction to hold the jaws in whatever'position they .may be set vide spring washers 41 upon the plvot pin 40, or 14, or both; These will suflice, if

' properly adjusted, to hold the jaws inset links may be'employed withoutvthe cam surface 11 if desired, or that they may be em- Copies of this patent maybe obtained for'five cents each, by addressing the Commissioner otla'tents,

ployed onlyto insure the opening 1' of the jaws, either being within the scope of my primary jaw, the handle and jaw having 7 -'complemental pivot ears at an end of 'each and a pivot pin connecting them, the handle having an outer arcuate edge face having its center of curvature inward in the direction of the handle from the pivot point of the primary jaw, a secondary'jaw, both said jaws having complemental pivotears pro jecting from their middle portions toward each other and a pivot pin connecting them, 7

the inner end of the secondary j aw carrying V a roller engaging the arcuate side surface'of the handle, and links pivoted upon the bandle at the center. of said arcuate surface.

In testimony whereof I have hereunto aft fixed my signature this 18th1day of October,

' OLE A; onnrsrornnnson;

Witnesses: 7 I a V H. L. REYNOLDS, PENROSE L.- McELwAIN.

Washington, D. G. a V 

